Was heading back to put the boat on the trailer and noticed the oil pressure was really low, so i shut it off. Checked the wires to the sending unit and gauge and then fired it back up and it was at zero? What could have caused this? Oil pump driveshaft snapped, oil filter clogged, pickup fell off of oil pump? I pulled the filter off and it was completely full and put a mechanical gauge on the motor, started it up for about 2-3 seconds. no oil pressure. Boat has a 10qt pan on it, going to try a new filter and see if maybe the old one got plugged up somehow, but probably not my luck.